Multiple header rows exporting Google Sheets to JSON - json

Question

I am trying to export google sheet to JSON formatted text so I can read it into another program. Entries are indexed by multiple headers for the row and columns. I can't share the data as it is not compliant with GDPR, so I have an example below.
E.g.
If I was constructing a table of spells in D&D to determine when they were introduced, I would have the field being School of Magic, the Subfield being the spell down the left column, and then across the header would be indexed by the edition (1 through 5), with sub headed with Base and then name of expansion, each cell is empty or just has a string saying "Yes" if it is present.
Image added to clarify.
Example table structure
This would then return an entry like this when exported
{
"School of Magic":"Necromancy",
"Spell":"Abi-Dalzim's Horrid Wilting",
"Edition":"5th",
"Book":"Elemental Evil Player's Companion"
"Elemental Evil Player's Companion": "Yes"
}
I am using this as a base to export
https://gist.githubusercontent.com/pamelafox/1878143/raw/6c23f71231ce1fa09be2d515f317ffe70e4b19aa/exportjson.js?utm_source=thenewstack&utm_medium=website&utm_campaign=platform
But I am incredibly new to JSON and I can't quite work out how to have multiple headers.
Any help here would be appreciated regarding how to adapt this or even just where to look to solve this sort of problem as I can't find documentation that points me in this direction.
Below is a link to a csv file of a similar table, hopefully I haven't just doxxed myself.
https://docs.google.com/spreadsheets/d/e/2PACX-1vSEHGJgn3x4gpyXfBYqRSoJieiZIoDSbJt_pys_TQM-SzXVJjubJbzOvmUT0cUSRRBYUpkKxPq1IOj_/pub?output=csv
The idea would be that in this example the output would show whenever a given spell was introduced within each edition. So the output would be like:
{
"School of Magic":"Necromancy",
"Spell":"Abi-Dalzim's Horrid Wilting",
"Edition":4,
"Book":"Exp2",
"Exp2": "Yes"
"Edition":5,
"Book":"Elemental Evil Player's Companion",
"Elemental Evil Player's Companion": "Yes"
}
{
"School of Magic":"Necromancy",
"Spell":"Raise Undead",
"Edition":1,
"Book":"Base",
"Base": "Yes",
"Edition":2,
"Book":"Base",
"Base": "Yes",
"Edition":3,
"Book":"Base",
"Base": "Yes",
"Edition":4,
"Book":"Base",
"Base": "Yes",
"Edition":5,
"Book":"Base",
"Base": "Yes"
}
If this makes sense? In the true data these cells contain information of interactions between the subcolumns so it is important that I can identify which sub columns and what the entry is.

Answer 1

Try
function table2json() {
var sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
var [headers, ...rows] = sheet.getDataRange().getValues();
var items = []
rows.forEach(function(r) {
var obj={}
r.forEach(function (c, j) {
obj[headers[j]] = c
})
items.push(obj)
})
console.log(JSON.stringify(items))
}
edit
according to your new data and your spreadsheet, try
function myFunction() {
var sh = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet()
var data = sh.getDataRange().getValues()
// rebuild a complete set
var temp = ''
data.forEach((r, i) => {
if (i < 2) {
r.forEach((c, j) => {
if (j > 1) {
if (c == '') { data[i][j] = temp } else { temp = data[i][j] }
}
})
}
else {
if (r[0] == '') { data[i][0] = temp } else { temp = data[i][0] }
}
})
// extract informations
data.forEach((r, i) => {
if (i > 2) {
var result = []
if (r[0] == '') { data[i][0] = temp } else { temp = data[i][0] }
result.push([data[2][0], data[i][0]])
result.push([data[2][1], data[i][1]])
r.forEach((c, j) => {
if (j > 2) {
if (c != '') {
result.push([data[0][j], data[1][j]])
result.push(['Book', data[2][j]])
result.push([data[2][j], data[i][j]])
}
}
})
console.log((result))
}
})
}
result
[ [ 'School', 'Necromancy' ],
[ 'Spell', 'Abi-Dalzim\'s...' ],
[ 'Edition', 4 ],
[ 'Book', 'Exp2' ],
[ 'Exp2', 'Yes' ],
[ 'Edition', 5 ],
[ 'Book', 'Elemental Evil ...' ],
[ 'Elemental Evil ...', 'Yes' ] ]
[ [ 'School', 'Necromancy' ],
[ 'Spell', 'Raise Dead' ],
[ 'Edition', 2 ],
[ 'Book', 'Base' ],
[ 'Base', 'Yes' ],
[ 'Edition', 3 ],
[ 'Book', 'Base' ],
[ 'Base', 'Yes' ],
[ 'Edition', 4 ],
[ 'Book', 'Base' ],
[ 'Base', 'Yes' ],
[ 'Edition', 5 ],
[ 'Book', 'Base' ],
[ 'Base', 'Yes' ] ]